Charlie Sorrel has the step-by-step to get shortcuts to run on your Mac from the iPhone.
While it is possible to get the Shortcuts app running in macOS Catalina via Catalyst, you can’t do much with it. But what about the next best thing? How about selecting something on your Mac, then tapping a shortcut on your iPhone, and then having the result show up back on your Mac?
Plenty of steps but it works.